If you grew up in the 70s and 80s, there was a fair level of AOR hard rock that ruled the music scene. Styx in their glory years, mixed rock guitar from the James Young/Tommy Shaw side with musical theater from Dennis DeYoung. That tension between different styles made for songs a bit different than average, but also created pressures between the musicians. They had at least three concept albums and touched in prog rock during the band early years, later moving towards commercialism.